main difference between RS-232 and RS-422, beside the voltage level, is that the latter is twisted pair/current loop which provides noise immunity and ability to run over long distances(hundreds of feet).
So conversion from RS232 to 422 should be done as closely as possible to the source.
cheers,
BG
www.finale.tv
From: "bigfish@pacbell.net [Avid-L2]" <Avid-L2@yahoogroups.com>
To: Avid-L2@yahoogroups.com
Sent: Wednesday, September 5, 2018 11:48 AM
Subject: Re: [Avid-L2] Deck Control Issues
I've run RS-422 over 150 feet using belden audio cable without issue. IIRC the main difference between RS232 and RS422 is voltage. I may be mis remembering this so please correct me if I'm wrong on that. I don't know if RS232 is harder to run long distances than RS422.
---In Avid-L2@yahoogroups.com, <forshurz@...> wrote :
I would put an extender/repeater on the cable. I believe the max is 50ft for RS232.
On Sep 5, 2018, at 10:21 AM, avid@... [Avid-L2] <Avid-L2@yahoogroups.com> wrote:It's about 75ft. It worked over a similar distance (with the same cables) previously.From: Avid-L2@yahoogroups.com <Avid-L2@yahoogroups.com>
Sent: Wednesday, September 5, 2018 10:11 AM
To: Paul Darrigo fedguy2@... [Avid-L2] <Avid-L2@yahoogroups.com>; avid@...
Subject: Re: [Avid-L2] Deck Control IssuesWhat's the total distance for the 9pin?On Sep 4, 2018, at 6:21 PM, avid@... [Avid-L2] <Avid-L2@yahoogroups..com> wrote:Recently I helped a customer move their machine room and edit systems. It all went well, except for one system which will not do deck control – although it did before the move.I've hooked up dozens of these over the years but I am stumped.System is a Win7 HPz440 running Media Composer 8.4.something. I have tried 3 different USB to Serial adapters, 2 Rosetta Stone cables, temp cabling to the machine room and bypassing the machine control patch panel. I am also into a USB2 port since I have found they don't work on USB3.So probably not hardware.On the software side I have uninstalled and reinstalled the Keyspan software, confirming it is the same version that other working systems are using. I have also confirmed the same firmware. I have tried various virtual ports, allocated in the Keyspan software.Any thoughts, suggestions, ideas appreciated.- Dave(971) 267-7661
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Posted by: Bogdan Grigorescu <bogdan_grigorescu@yahoo.com>
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